Examine source code of Night Blue Telegram

{
  "name": "Night Blue Telegram",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Screenshot 2019-04-16 at 22.48.20.png"
    },
    "colors": {
      "frame": "rgba(22, 29, 40, 1)",
      "tab_background_text": "rgba(225, 225, 225, 1)",
      "toolbar": "rgba(27, 34, 46, 1)",
      "bookmark_text": "rgba(250, 250, 250, 1)",
      "toolbar_field": "rgba(35, 45, 60, 1)",
      "toolbar_field_text": "rgba(250, 250, 250, 1)"
    }
  }
}